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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b14f54b64bf11b2c829370da4086f7081aa8c05ea60db0a98da76eabfc6e5f3' 
  AND token = 'vi9xG/mlPu4yvMNfz7pt/KaQq5e2RMzMK8ppBTJqg4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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