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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c4644b9eb7aa978fdb8d0ef10324074b8752c6ba57d3c195eaf34184f6adec' 
  AND token = 'MdUJHA52iNvepJQENA6u6CT75FEp+M8d5Su81ph33fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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