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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028c47475a9bad2e0fd09c53cc7061a1b70893e13bba181bf55046fd693192f8' 
  AND token = 'vmqvhuhdgl7ph42AJAH0n0h3FY9TY4mOuPmWERYQfgI=' 
  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"
    }
  }
}