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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5387cdb6d7805c4c5a3643d295be509c74b7716eb76adf0d2098eab6cf8ec3e3' 
  AND token = 'jj5WyZFa6RofI0nbHTMJ++VHlIqBTaDmP8+6LZePFkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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