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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2142612efa8e9ffddae89ad3c3a04bde93735a79b463829413195b27cb4312ab' 
  AND token = '3HBRoYKvxjCl4T9R3phBGJwLU2drndGbfkW0Fs1ZKmo=' 
  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"
    }
  }
}