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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d4d3be2e2569087255465eea33fbc47764ac51f46b3950076515ee3f09a3b5' 
  AND token = 'g3VHhXF1nbD+u+a+u5aUNq4a0G9b5wfC7sbnKjQelHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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