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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f31d07ff580154645ab33c147b0a28fd5c04d75c5276b3d6dc51b060e30b36' 
  AND token = '1Xb3NR/nGJIF3PCEM4vrc9mp+qJ4I1/uJ66bVIfs3Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}