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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e56653c9084c320523837c74d31197a6ba1f723a5a38cd34d42d3eb35c4c0ee' 
  AND token = 'VVZGOiZYpUVWknku4F2PRbDkEuNByOejWWgS/0fxWkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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