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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fed3a2a2be5739619f07ab39821fcf344fc808c6964dc89da32577ac6ae7ca0' 
  AND token = 'iwxAq72SqzA+spYHmpxLMaF9/cfWndRUW7ZaNa1ckVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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