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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55b86bfa25bc75733f34278a0eff3ffb1b1fab7d4796053a8ecff1376630d23' 
  AND token = 'ch19g7QhZxqEg5p28kmYFwycTAMop4+60Vyy5FUjcI8=' 
  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"
    }
  }
}