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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43ac39c2bcb7f438496fe8422d1538d7639128a210a3d0fa5180e15a93d28cb' 
  AND token = '5qGHbVkFTxEORXT2E5v7jh8LDf4joS6qTetwtQcOonM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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