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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e466ac92e618dc2cda6cef6050a2624f8cd285681da8842a873b3873ec167a' 
  AND token = 'W+ri5WxfNbQEFXP91X2twFkf33AhmBY1ZTO3ACvFPvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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