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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7700d47289ac2e8c0e41c3f67f027a216042501dccafbc2f9c09a29a6ae293' 
  AND token = '47+w/BLdRf+noVV7jeB8Olld7+rYop+tkmsqN2C3cIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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