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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052c17c3e56c2107c41690fb395208603b50a1b389f983de48cc86b6375039c7' 
  AND token = 'Cg1ry9A7F4uE7oVxNzQzdNjWV24B92eEZmvdSlAPN6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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