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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c84425dff5eb570c2e042b7afaac0446d35b4cdf0a94e4a194c59ca6195b25d' 
  AND token = 'tn4PMkwFnqx+8yEZpyvA82RgUlmjluehOaEf6Mw26Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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