SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ff72568f8f888248b553234c0a64043c6fe93c2245e837fa921258c271831f' 
  AND token = 'q+0YeB/dcVCCCp/+RRP5ShDqINwVuObP6OVymQdLbB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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