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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0961d4759694f31ac805eef8f8bd8c070deefe7f1389fc87f3b4add2b10a6e40' 
  AND token = 'ODXs/ia1w+Y3S3puDL27MmMInhDhdyQHwd3TVTfjDH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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