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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6424c091114e4f1ce783281f30719550f8c633737a9bc7cfbd888f2684ea0e21' 
  AND token = '9cwDYwxsJ86H2ZR01YuJX57LxgPF6HGUUGSY0ccJYEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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