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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ff100a9252261f52b1cbb5d3d1632dc06d12c68b6405eb2e76ecd69e068ecf' 
  AND token = 'LPWd/jkGJIVSWz4OQavNc8Y6g8ampu/V7feUESMXQUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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