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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f77b164926bf52a2ef69df264db9ea7265cd8ec35293c5b26157085d138470' 
  AND token = 'CRsyFYO6lZoUqRYDDKD7IcP2yR98d7605W2tLqeybKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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