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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd417c4c6cb12be437fdde93b11dbabd5861cb39b4a11ca1761612c4d4e90a23e' 
  AND token = 'BpbVxxKd1MLHP1UsgQS8/Cg+Te/TQgL3X7a7uydXyV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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