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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8cd4bb8768ca0849f7fe13c9b6f313a85d48b60f5ff789def1513c9973cbef' 
  AND token = 'cwZOhXe4DAgG9ALJEwFPod1SyYivCCNIMUBXeLKphNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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