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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbc5a2c640d4d8b576fbce1a9c79b31c69f450d6a980b94793b6dd71ce26de2' 
  AND token = '03Jkf1/w849vhYnyJDbh8SKJaeLPwMLzbUH2Y54NqYY=' 
  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"
    }
  }
}