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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafad30d1e294499313fc1198d04306813faa15fb591eb559170f051a0af2d54' 
  AND token = '7182vZ5fPy3JT4AqULL4DD0QSw8MYnxq1ByXfo0gAB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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