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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2827167a7c44065db19cc181e57077f309c637250d1e6e0806a9677be9460059' 
  AND token = 'rZo+/FIuJOaClvpNJ3TbwOAVeaTKR5n0J9i7TKAmRJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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