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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fc7e8bde57c3ddcfca83cd97b33db07e958d8894b8572c4480734e1b75528a' 
  AND token = 'c1f58CLsdaJAcXDOb95UI3nD6JVgAla0V2IIZgmk3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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