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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4787e77647a5271c2927bf6d0b6d1fb4538b9fd5e18d0ed169212a6717153762' 
  AND token = '1nUJzh7rK0fbRc1ohE7HzPKNjmZ6289vGelFi6dHPDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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