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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b23a7b1ecb03ae9d79e06456507e7ba82424f4b1ae72d02a0d61fe864560de' 
  AND token = '2zQ9t9XEhcQZXJ5+4hmE93VAh2BZFnCTG7lRLQnUCKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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