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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b88eb50ea959f591ea300ffbc5a370aa698a416b417865ed53e65376ab57e59' 
  AND token = 'FFAeBP8+PsXQuXXlwiE56Rw/90sX+4Zn3lpxqr9+0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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