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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048779d152dc2f159e6c1d42d859b0eb6452612b74d4db2d550ca47bda02a588' 
  AND token = 'JlLNTl3F6R+HC3oovna4sosXP2DgVbTCnbWoyoNgdUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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