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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36d53420668710a8079056ab91f70b0920c002a103d1ba6b556aacbb4905f2e' 
  AND token = 'SJJxlGKY/ZsrY2Lnf0m4HRDpVBVgREOSz0YRmkt9lgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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