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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa37eee5b0269f1fa71bd0737445b5f066df8f6114e68064dae3bb22525fee58' 
  AND token = '3VaUi9PatJwKyELMhfUa65MW14kXSgdJTNOO2SjcdQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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