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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd9c128af193c9c50197ca703ee338bc5d011d1959facbc0449cbfe77cee7bb' 
  AND token = 'X5kQLHt0+zulTeXxqmONz2cnWtTVBH/gfyw+5TUmOAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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