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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1817646c72afed481edba2a35d22e917065ed1daad44ff3f81c54cadba8e33c2' 
  AND token = 'Xs7QTo6nJXRH/t+zhEb2/nLTGFWB8rQuLf5ME/O2lEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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