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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808ad862064060f65e63f473363cfaf4876658875449492d558fa0c9f64fcaa5' 
  AND token = 's0czqfY8GBfrmU8IXVZM1Y3P6vjlYS7ijL65/yUm/0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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