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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be80373c30a2f50b1e9f84a1bb7dd1cd878f00e102763058eb4b7af39f7b492' 
  AND token = 'dnYbWc+KoiuLNqyhV1mwRbUkxFwtW7aIOt3zEDpCX5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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