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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1222b58b5f5c836398574ee6d6b65d10b346fded3cf54715691a718ef8ec3e7' 
  AND token = 'fcnZqYlHS6cHpY+g4ippq9MNtSjz8BwAnVVSLI6ISWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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