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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9d2cebcbe5d32838869aeccfb51bada525cbf45ae4d7f133405c46f209d68c' 
  AND token = 'EGNQwAT23iqf9RJC0RX/PYZF9iC8IuC/Z/17AHUEa5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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