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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6125603f1cb49d98085ec425f239e796fe7ec354d1123eba24ad441dfe5c024f' 
  AND token = 't+FRsmhYtVpODDoH+9eJXZ+ybqC4sGXY+w4CupTem5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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