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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0be02b426b914e20f4dcac0f7568f7e8118634b0c4f12a296178c49189a77b' 
  AND token = '7wmv1W9xqMqE8wQJ0dpm5e4iHyxAA0lTB1oZrjxgo1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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