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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50984d2da8342b783d25501c5a13a4ae58b8f857494464cf4caeb39bf4e4507f' 
  AND token = 'TcImgJKKRNWnVp8k83o+fxNTr9zRbAJW985jHbBWss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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