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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04d87bab0d9d59305cacb5fe0ffffdd7f9d9987d9e122657acd3a0f9fb45185' 
  AND token = 'boufQ/dFzNPdvj5QVYV/qOLjOrujH9HVL16yRZXJHHE=' 
  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"
    }
  }
}