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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fea5fbc2957fa033f73dd9a73eaae25d525e7c487b62485a652a638aec1b97f' 
  AND token = 'hGkxfSX6ZXW/ZT0O7zMT2Y6PEXECnNpGHu3xY3/3YJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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