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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c69aac63fb424f56024f9392f89e85f4f3da102fe1b8717a614fb984ae1fadb' 
  AND token = 'Ms/vzHjWdRcYBfCx0eNrECwuUY4THyNUhsQPril28fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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