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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeef151eecb35133fb63cea7f8e43d4cd0af80e75e01ea68ca8e43435854ae40' 
  AND token = '8ctb52hpCy8HrUIbZvlobbFDbkSL7ttFk7p0BdQU1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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