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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4575b178f2fd90d2abb4e7b2fc2554c9782a70e1b4750459c9e54b0a573361' 
  AND token = 'U1RC14QY6YFpJmd1IF5Am+5mwEwhbvrdtNdYyeWCIvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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