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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb1b48ea0f623477e58170353143d7b81d651a88b2022d87183d8c9c5c9ae67' 
  AND token = 'i2FHVlgtyxLUb91di4cMgQ20+wfHqmezDJcmPH70ZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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