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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6322165c394e4a00a0ac12366b187d1bf1d2c65721eb9d954ae96936ae180d06' 
  AND token = 'XzZlv5NhKt3f/IBeQ4bNmeK19dEqin5Ijr4QQyj07ow=' 
  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"
    }
  }
}