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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883c67996aad653baa4f5fb8e5d154b5e76d6c9f20801c5c5c8f9df4e19f2b81' 
  AND token = 'DGN5RyvT+V4oSt7ajmtAlihBPFpe9c2O774CJDZGx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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