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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a001ccf89d483c2833ffd1254a6cd3d9bfc2632b9a7570ab5b121e11c4d2b83' 
  AND token = '5Pi8yw/e5wTv+uMZO3PgHxd4sTD5hFaqmOhthx1wGVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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