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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00888b00dd502481412de420e1bdeaf7612eb5aad777e753b138321e73acd9bf' 
  AND token = 'LyIuSAv1kkRoClAV/g+nBFoYm+Y9E81OyIOCGIXcioA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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