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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1710da6493a8c403b9b8bb2c6cf32c7cd9415da2f8120f8d6a261ede712720' 
  AND token = '2/DXG91rh/i6xjeY1OJwQzYxNk4cNVD80bOV23vnWYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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