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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1140c80a404201967db573eeabea77658cc391e0902dd42ee4406f51c629d6c2' 
  AND token = '4bSpUl2B9BXCI8277h3ghOaQyM81D2q3G21iQubnOI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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