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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceccb7ab5208c95c80e98247fdeef4a0a52bd3479558178a32f8642ea4397ad' 
  AND token = 'P3JRUSl17qXyxiCiU9+f52UZmBGPs0Dw7rSjtSmlOsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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