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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3150d4e845da9b5a08988d94c1f75bc9c164b3be0e72695ab611eff079b54e' 
  AND token = 's8kCtDgLynG2rq9TMX0nuYk9qrOIRadQfOxj4mDl1Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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